Get first node using E4X with mixed namespaces?

Consider an XML snippet with a handful of namespaces:

<meal xmlns="urn:hl7-org:v开发者_StackOverflow社区3">
    <veg id="7" />
    <lunch id="123">
        <veg id="990" />
    </lunch>
    <dinner id="324">
         <veg id="111" />
    </dinner>
 </meal>

Using JavaScript E4X, how can you explicitly select the first veg node's id property?

It's important to explicitly include all namespaces as well. This is the reason for my ..*:: syntax below. I realize I'm using the wrong operator here.

I've tried this, which unfortunately gets ALL veg node id values:

var veg = meal..*::veg.@id.toString()
//currently gets 7990111

How can I get the value of 7?

var veg = meal..*::veg[0].@id.

var meal = // xml;
var veg = meal..*::veg.@id[0];

Try this : var veg = meal..*::veg[position()=1].@id.toString()

veg[position()=1] tells XPath you want the veg node at the first position. I just complete your initial xpath expression.